Hi Nora - Yes, you are correct. Here is how I think about it.... YOU singular can be te, ön, or maga - that is informal singular, formal polite singular, and informal, polite singular. You would use ön in official situations, or for formal address to an officer, etc. You would use maga for talking politely with a neighbor, or an older person, but nothing official.
YOU ALL (you in the plural form) can be ti, önök, or maguk - that is, informal plural 'you all', önök for polite plural, formal, and maguk for polite, informal situations.
Then, you just need to remember that ő, ön, and maga all have the same form (3rd person singular verb conjugation), and ők, önök and maguk all have the same form (3rd person plural verb conjugation). It's a little bit strange because you are saying 'you all' politely (formal or informal), but using the 'they' verb conjugation (3rd person plural), instead of the 'you all' ti form.
Hope that helps!